Interesting. So that wasn't Naruto's full power at final valley 2. Thanks for confirmingSasuke can't use Indras arrow anymore because he needs the bijus for that (at least thats what i think)
Naruto can get more power because in the fight against sasuke he stated that naruto barely had any chakra left.
So according to what the sage toad said the bigger the chakra the more senjutsu you could obtain and balance it.
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Had naruto be in full power his double TBBFRS Would have been powerfull enough to overpower indras arrow.